Torque Calculators: Free Bolt, Motor & Load Design Tools

Solve torque-related mechanical design problems with our free online torque calculators. Whether you are calculating bolt tightening torque for a flange assembly, determining motor shaft torque for a conveyor drive, or finding the torque required to lift a load with a lever arm, these tools deliver precise results instantly. Enter your force, lever arm length, rotational speed, or power rating to receive torque magnitude, unit conversions between Nm, lb-ft, and kg-cm, and safety factor recommendations. Each calculator includes thread friction coefficients, bolt grade specifications, power-to-torque conversions, and dynamic load factors for real-world engineering application. Mechanical engineers, maintenance technicians, and automotive specialists use these tools to prevent fastener failure, size motors correctly, and ensure safe mechanical power transmission. From hand-tightened screws to industrial drive shafts, our torque calculators cover every rotational force need. No signup required—access from any device and design with confidence.